Novel Structural Materials Through Microstructural Control in Liquid Phase Sintering

该提案研究了在 超固相线液相烧结（SLPS）。 这是一 液态金属粉末的致密化技术 沿着晶界，导致颗粒分解，毛细作用， 诱导的晶粒重排和溶液再沉淀。 包括考虑液体流动的性质， 与初始粒子有关的粒子崩解机制 成分、冷却速率和微观结构。 过程变量 包括温度、粒度、加热速率和预烧结 退火 影响烧结行为的因素包括 润湿、孔隙填充、液膜迁移和压实 致密化 几种表征技术（光学和 电子显微镜、透射电镜和差热分析 研究了显微组织演化及其影响因素 处理变量）。 烧结图显示了 参数是研究的结果。 %%% 该工艺提供了近净成形能力， 质量零件。 潜在的应用包括蒸汽涡轮机 叶片、发动机部件和工具钢。

This proposal examines microstructural evolution during supersolidus liquid phase sintering (SLPS). This is a densification technique for powdered metals in which liquid forms along grain boundaries causing particle disintegration, capillary- induced rearrangement of grains, and solution reprecipitation. Included are considerations of the nature of liquid flow and the particle disintegration mechanism related to initial particle composition, cooling rate, and microstructure. Process variables include temperature, particle size, heating rate, and pre-sinter annealing. Factors affecting the sintering behavior include wetting, pore filling, liquid film migration, and compact densification. Several characterization techniques (optical and electron microscopy, dilatometry, and differential thermal analysis are employed to study the microstructural evolution and influence of processing variables). Sintering maps that show the significant parameters are an output of the research. %%% This process offers near net-shape forming capability for high quality parts. Potential applications include steam turbine blades, engine components, and tool steels.